title: Effect of calcium hydroxide intracanal dressing on the bond strength of a resin-based endodontic sealer.
abstract: The aim of this in vitro study was to evaluate the bond strength of Epiphany resin-based sealer to dentin walls after placement of calcium hydroxide [Ca(OH)2] dressings. Fifteen extracted single-rooted human teeth were instrumented using 2.5% NaOCl + EDTA as irrigants. The teeth were randomly assigned to 3 groups (n=5), according to the intracanal dressing: G1= Ca(OH)2 + saline; G2= Ca(OH)2 + 2% chlorhexidine gluconate (CHX) gel; and G3= saline (control). After 10 days of storage in 100% humidity at 37 degrees C, the dressings were removed and the root canals were filled with Epiphany sealer. After additional 48 h of storage, the specimens were sectioned transversally into 2-mm-thick discs. Push-out tests were performed (1 mm/min, Instron 4411) and the maximum loads at failure were recorded in MPa. One-way ANOVA and Newman-Keuls tests showed a statistically significant decrease in bond strength when a Ca(OH)2 dressing was used before root canal filling with Epiphany (G1= 10.18 +/- 1.99 and G2= 9.98 +/- 2.97) compared to the control group (13.82 +/- 3.9) (p< 0.05). It may be concluded that the use of Ca(OH)2 as an intracanal dressing material affected the adhesion of Epiphany to the root canal walls, but even though the values were within the acceptable range found in the literature.
authors.affiliation: Department of Endodontics, Dental School, University of North Carolina, Chapel Hill, NC, USA. barbizam@upf.br
authors.forename: João Vicente Baroni
authors.initials: JV
authors.lastname: Barbizam
authors.forename: Martin
authors.initials: M
authors.lastname: Trope
authors.forename: Erica C N
authors.initials: EC
authors.lastname: Teixeira
authors.forename: Mário
authors.initials: M
authors.lastname: Tanomaru-Filho
authors.forename: Fabrício B
authors.initials: FB
authors.lastname: Teixeira
mesh_terms: D000891:Anti-Infective Agents, Local / Q000627:therapeutic use; D002126:Calcium Hydroxide / Q000737:chemistry* / Q000627:therapeutic use; D002614:Chelating Agents / Q000627:therapeutic use; D002710:Chlorhexidine / Q000031:analogs & derivatives / Q000627:therapeutic use; D001840:Dental Bonding; D019551:Dental Disinfectants / Q000627:therapeutic use; D003804:Dentin / Q000648:ultrastructure; D004492:Edetic Acid / Q000627:therapeutic use; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D012387:Root Canal Filling Materials / Q000737:chemistry* / Q000627:therapeutic use; D012388:Root Canal Irrigants / Q000737:chemistry* / Q000627:therapeutic use; D018915:Root Canal Preparation; D012965:Sodium Chloride; D012973:Sodium Hypochlorite / Q000627:therapeutic use; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors
chemical_list: D000891:Anti-Infective Agents, Local; D002614:Chelating Agents; D019551:Dental Disinfectants; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; C486893:epiphany sealer; D012965:Sodium Chloride; D004492:Edetic Acid; D012973:Sodium Hypochlorite; C010882:chlorhexidine gluconate; D002126:Calcium Hydroxide; D002710:Chlorhexidine